WASHINGTON — During his tenure as attorney general of Oklahoma, Scott Pruitt, now the Environmental Protection Agency administrator, closely coordinated with major oil and gas producers, electric utilities and political groups with ties to the libertarian billionaire brothers Charles and David Koch to roll back environmental regulations, according to more than 6,000 pages of emails made public Wednesday.

The publication of the correspondence comes just days after Pruitt was sworn in to run the EPA, which is charged with reining in pollution and regulating public health.

“Thank you to your respective bosses and all they are doing to push back against President Obama’s EPA and its axis with liberal environmental groups to increase energy costs for Oklahomans and American families across the states,” said one email sent to Pruitt and an Oklahoma congressman in August 2013 by Matt Ball, an executive at Americans for Prosperity. That nonprofit group is funded in part by Charles and David Koch, the Kansas business executives who spent much of the past decade combatting federal regulations, particularly in the energy sector.

U.S. President Donald Trump will reverse a handful of Obama-era environmental regulations in executive orders that could be signed as early as this week, the Washington Post reported on Tuesday, citing unnamed sources with knowledge of the orders.

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Pruitt has been among the most contentious of President Trump’s Cabinet nominees. Environmental groups, Democrats in Congress and even current EPA employees have protested his ties to energy companies, his efforts to block and weaken major environmental rules, and his skepticism of the central mission of the federal agency he now leads.